LONDON – Prince William and his wife, Kate, marked a milestone for their newborn baby Princess Charlotte on Sunday – a christening ceremony on Queen Elizabeth II’s country estate that was steeped in royal tradition. Hundreds of fans outside St. Mary Magdalene Church in Sandringham, a sprawling royal estate near England’s eastern coast, cheered as William and Kate arrived with toddler Prince George and 9-week-old Charlotte, who was in a vintage pram. It was only the second time Britain’s newborn princess, who is fourth in line to the throne, has been seen in public since she was born on May 2. Like her elder brother George, Charlotte was dressed for the occasion in a replica of the intricate lace-and-satin christening gown made for Queen Victoria’s eldest daughter, also named Victoria, in 1841.